1.A marble rolls with a velocity of 10 mm/s [E] on a game board that is being pulled [60^oN of E] at 40.0 mm/s. What is the velocity of the marble relative to the floor?

A Challenge. . . Be careful - is this vector addition or subtraction?

2.An airplane flies with a velocity of 55.0 m/s [ 35^oN of W] with respect to the air (this is known as air speed). If the velocity of the airplane according to an observer on the ground is 40.0 m/s [53^oN of W], what was the wind velocity?

3.If you were trying to cross a river with the shortest possible time, would you aim your boat slightly upstream, directly across the river, or slightly downstream? Explain.

Please while doing these explain the steps so the kids can understand this when i show them the lesson